Erzeugung und Charakterisierung porenbehafteter Prüfkörper für Schwingprüfung und Gießsimulation

Hilbinger, Rolf Michael; Gerth, Stefan; Randelzhofer, P.

doi:10.1002/mawe.201600706

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…2,8,9 Up until now, research on the topic mostly achieved gas-loading through passive methods, such as casting the metallic alloys under atmospheric conditions, then correlating the daily air humidity with the resulting porosity, 2 or by introducing effervescent tablets into the hot melt. 10 However, these approaches do not allow for accurate control over gas saturation. Thus, the need arises for a casting furnace enabling calibrated adjustment of all environmental factors so as to eliminate or promote the desired type of porosity.…”

Section: Introductionmentioning

confidence: 99%

Gas-loading furnace for deuterium-charged alloy-casting

Werner

Lehmann

Baumann

et al. 2020

Review of Scientific Instruments

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Section: Introductionmentioning

confidence: 99%

Gas-loading furnace for deuterium-charged alloy-casting

Werner

Lehmann

Baumann

et al. 2020

Review of Scientific Instruments

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“…On the one hand, preliminary studies [38] reveal a proper conformance with Murakami’s empirical approach, but the present model does not invoke the defect size distribution itself. As presented in preliminary studies [39,40,41,42], the statistical distribution of flaw sizes can be evaluated by non-destructive investigation of the defect population, such as X-ray computed tomography scanning. However, the statistical distribution of the most extreme values evaluated from the XCT does not always represent the distribution of fatigue fracture initiating defects, due to the fact that cracks may initiate at the surface near heterogeneities even in the presence of larger flaws within the bulk volume (see [43,44,45]).…”

Section: Introductionmentioning

confidence: 99%

Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

et al. 2018

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Cast parts usually inherit internal defects such as micro shrinkage pores due to the manufacturing process. In order to assess the fatigue behaviour in both finite-life and long-life fatigue regions, this paper scientifically contributes towards a defect-based fatigue design model. Extensive fatigue and fracture mechanical tests were conducted whereby the crack initiating defect size population was fractographically evaluated. Complementary in situ X-ray computed tomography scans before and during fatigue testing enabled an experimental estimation of the lifetime until crack initiation, acting as a significant input for the fatigue model. A commonly applied fatigue assessment approach introduced by Tiryakioglu was modified by incorporating the long crack threshold value, which additionally enabled the assessment of the fatigue strength in the long-life fatigue regime. The presented design concept was validated utilising the fatigue test results, which revealed a sound agreement between the experiments and the model. Only a minor deviation of up to about five percent in case of long-life fatigue strength and up to about 9% in case of finite-lifetime were determined. Thus, the provided extension of Tiryakioglu’s approach supports a unified fatigue strength assessment of cast aluminium alloys in both the finite- and long-life regimes.

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Statistical analysis of micropore size distributions in Al–Si castings evaluated by X-ray computed tomography

Garb

Leitner

Tauscher

et al. 2018

International Journal of Materials Research

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In general, micropore size acts as one of the most significant influencing factors on the fatigue strength of aluminium castings. Hence, an in-depth knowledge of the occurrence of micropore sizes and their local distributions in different locations in complexly-shaped lightweight components is of great interest to the casting industry. In this work, the local properties of AlSi8Cu3 and AlSi7Cu0.5Mg cylinder heads and AlSi8Cu3 crankcases were analyzed. Extensive X-ray computed tomography (CT) scans of three specimen positions revealed significant differences in micropore size and distribution. Two CT scan resolutions were selected, with respect to different micropore size populations in the cast components, to enable accurate detection of the microporosity, in addition to an adequate scanning volume, in order to achieve a statistically approved parameter study. Thereby, specimen positions exhibiting smaller mean micropore sizes were scanned at 3 μm/voxel scanning resolution and ones with larger micropore sizes at 8 μm/voxel. A statistical assessment of all of the alloy specifications and specimen positions indicates that the general extreme value and lognormal distribution appropriately describe the micropore size distributions. Finally, an extensive sensitivity study is presented, aimed at examining micropore size characteristics, such as the porosity, sphericity, maximum and mean values and standard deviation, and to investigate their relationships in the investigated cast specimens.

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Erzeugung und Charakterisierung porenbehafteter Prüfkörper für Schwingprüfung und Gießsimulation

Cited by 3 publications

References 9 publications

Gas-loading furnace for deuterium-charged alloy-casting

Gas-loading furnace for deuterium-charged alloy-casting

Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

Statistical analysis of micropore size distributions in Al–Si castings evaluated by X-ray computed tomography

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